The owner of a facility that you are contemplating for your start-up coffee shop want to lower the rent by 15%-20% and the place looks great. Ask yourself why it has been vacant for so long and why the businesses that rented the place left.
It is time to do more market research. Perhaps there is not enough foot traffic to support your venture. What about on and off street parking? Will the college kids who are 20 blocks away come to your place. What will be the attraction?
Perhaps this is not such a good deal.